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Spectravideo SV 328- are power and video output compat with other machines?

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I know that the Colecovision supply outputs DC voltages, however it does have a transformer, and therefore there are internal AC voltages.  I was hoping that I could rewire the output of the transformer directly to the output of the power supply.  Based on the current rating of the DC voltages, the transformer probably isn't beefy enough, but I thought it was worth looking into.  I would gladly use those floppy disk supplies you mentioned, however I don't have one, and they don't seem to be commonly available.  Does anybody have a schematic of the Colecovision power supply?

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Aha, now I understand what you're trying to accomplish. If it wasn't for the connector, I believe the internal transformer of e.g. a 1541 has enough volts and amps for this purpose but that would be a two step process to combine an orphaned transformer with an orphaned connector.

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Back in the 80’s there was over 2 million ColecoVision’s sold, over 3 million Texas Instruments TI-99 series computers sold, and an estimated 100,000+ Spectravideo systems sold. Plus, maybe 50,000+ Blue Chip Commodore disk drives sold. That is an estimated 5.2 million systems made. However, over the many decades out of the 5.2 million systems made, only around 1% of those systems are still being used. So, an estimated 52,000 people out of the 5.2 million systems made are still using those systems in theory. So, if 52,000 people are still using those systems, then there will come a time when they will need a replacement power supply that requires a special 4 pin power connector.

 

Some company should have came out with a custom 4 pin power connector 20 years ago when the demand was a little stronger. I guess they say better late then never. Perhaps no one wanted to take the business risk of making a new expensive custom 4 pin power plug and cable mold for classic 80's systems that are not being made anymore. One never knows what the real world demand is for a product until the product is released into the real world. Some consumer electronic products are very popular when released, other products are not successful at all and end up being products that lose a lot of money.      

Edited by HDTV1080P

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On December 23rd 2019 a new high-end Power cable was released and a QTY of 500 are available on Amazon’s and EBAY’s website

 

Instead of creating a basic low-quality custom power cable and connector mold at half the manufacturing cost, a decision was made to make this classic 80’s style power cable with the best possible materials and manufacturing quality, so that this 21st Century custom power cable would be the best that has ever been made. According to the EBAY website if one purchases the 20 pack they can get the cable delivered at the manufacturing cost plus 0% markup.

 

*** This high-end top of the line 21st Century power cable is much better quality when compared to the original 20th Century power cables provided by Blue Chip, Coleco, Spectravideo, and Texas Instruments.  ***

 

 

 

**** Important info: This is a power cable only; a skilled technician needs to interface the power cable to a compatible power supply or compatible transformer in order to provide power with the following Computer and videogame systems.  **** 

 

 

100% compatible high-end power cable for use with the following computer and videogame systems

·      Blue Chip Commodore compatible disk drives

·      ColecoVision videogame system

·      Spectravideo 318 and 328 computer systems

·      Texas Instruments TI-99 series computers (Texas Instruments model numbers TI-99/4, TI-99/4A, and TI-99/4A QI). 

 

Questions and Answers

 

 

Question: What is the purpose of this power cable? 

Answer: This top of the line power cable is used by skilled technicians as a wire harness. With this power cable (wire harness) it allows a skilled technician to interface a compatible power supply or compatible transformer with the following classic 80’s systems: Blue Chip Commodore compatible disk drives, ColecoVision videogame system, Spectravideo 318 and 328 computer systems, and the Texas Instruments TI-99 series computers (Texas Instruments model numbers TI-99/4, TI-99/4A, and TI-99/4A QI). 

 

 

Question: What is the quality of this power cable when compared to the original ones used back in the 80’s? 

Answer: This 21st Century power cable is much better quality when compared to the original 20th Century power cables provided by Blue Chip, Coleco, Spectravideo, and Texas Instruments. This power cable was engineered in the United States and made in China using high quality materials with the help of automated machines. The original 80’s power cables were unshielded, did not use gold plating, used around 20 gauge thinner wires instead of the thicker 18 gauge wire, and did not have any Ferrite Beads. This new 21st Century power cable has a custom molded 4 pin plug with a total of 4 3u Gold-Plated pins. The other end of the power cable has a custom molded tail part with 18 gauge stripped and tinned wires. This 18-gauge power cable uses a high quality dual shielded PVC jacket. Both a single sided Aluminum Foil Shield and a Braid Shield. Also, this power cable has two Ferrite Beads to eliminate or reduce EMI/RFI interference bi-directionally from both ends of the cable (One black Ferrite Bead next to the molded 4 pin plug and one next to the molded tail part). This new 21st Century power cable is top of the line and can handle up to 300 Volts and is designed to last several decades.    

 

 

Power cable Specifications

 

100% compatible high-end power cable for use with the Blue Chip Commodore compatible disk drives, ColecoVision videogame system, Spectravideo 318 and 328 computer systems, and the Texas Instruments TI-99 series computers (Texas Instruments model numbers TI-99/4, TI-99/4A, and TI-99/4A QI). This is a power cable only; a skilled technician needs to interface the power cable to a compatible power supply or compatible transformer in order to provide power with the above Computer and videogame systems.

 

 

  • Power cable was engineered in the United States and made in China using high quality materials with the help of automated machines. 
  • High-quality custom molded 4 pin plug is Gold Plated and is designed to last several decades (Gold Plating provides corrosion resistance). 
  • This high-quality Power cable is ROHS compliant and is made with UL approved material.
  • Power cable length end to end is 6.56 feet (200CM).
  • One end of Power cable has a custom molded 4 pin plug with a total of 4 3u Gold-Plated pins. The other end of the power cable has a custom molded tail part with 18 gauge stripped and tinned wires.
  • This 18 gauge power cable uses a high quality dual shielded PVC jacket. Both a single sided Aluminum Foil Shield and a Braid Shield.
  • Power cable has two Ferrite Beads to eliminate or reduce EMI/RFI interference bi-directionally from both ends of the cable (One black Ferrite Bead next to the molded 4 pin plug and one next to the molded tail part).

 

 

Wire Specifications

 

 

Conductor: UL2464 18 gauge x 4 tinned copper wires + 1 black color wire that is the shield. Strands 16/0 .254+/-0.008mm. 20 degrees C, resistance maximum 23.2 ohm/KM.

 

Insulation: PVC insulation thickness NOM: 0.38mm, MIN: 0.28mm, Rated 80 degrees C, 300 Volts, Insulation Over Diameter: 1.98 +/- 0.10mm, Color: Yellow, Red, Blue, White, and Black for the shield.

 

Dual Shielding specs: This 18 gauge power cable uses a high quality dual shielded PVC jacket. Both a single sided Aluminum Foil Shield and a Braid Shield (16/6/0. 10TS+/-0.008mm).

 

Jacket: PVC Jacket, Average Jacket Thickness: Nom: 0.76mm, MIN: 0.60mm, Rated: 80 degrees C, 300 Volts, Cable Over Diameter: 7.00 +/-0.30mm, Color Black.

 

Markings: E332295, AWN STYLE 2464 18AWG, 80 degrees C, 300V, VW-1 PVC, FT1 -LF-.   

 

 

200CM cable view 1.JPG

200CM cable view 2.JPG

200CM cable view 3.JPG

ColecoVision back view.JPG

TI-994A BACK VIEW.JPG

200CM 4 PIN CABLE.jpg

4 PIN CONNECTOR - ColecoVision pinout.JPG

ColecoVision wire info.JPG

4 PIN CONNECTOR TI-99 pinout.JPG

TI-99 wire info.JPG

4 PIN CONNECTOR - Spectravideo and Blue Chip Commodore.JPG

Spectravideo and Blue Chip Commodore wire info.JPG

custom Gold plated connector.JPG

TI-994a back view.JPG

ColecoVision back view.JPG

ColecoVision back view.JPG

Edited by HDTV1080P
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18 hours ago, carlsson said:

So $25 + international shipping, or $13/ea if you buy 20 cables.

Those are EBAY and Amazon prices which includes free domestic shipping in the USA. The cable is available for shipping International on EBAY’s and the Amazon’s website. EBAY has a Global International shipping program where the EBAY dealer ships the package to EBAY’s International shipping center in Kentucky and EBAY sets the cost of International shipping based on the weight of the package and based on which country it is going to.   

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Posted (edited)

Okay guys,  I got one of these cables.  I must say they are very high quality, however $25 is a bit pricey.  Anyway  I have a couple of Billion power supplies, which are third party after market power supplies for the Commodore 64.  These are much easier to open than genuine Commodore supplies as there are just four screws holding it together.  I've attached a few pictures showing the internals of this supply which just has a single sided PCB with a 5V regulator.  I measured the 9VAC output at about 10.4VAC.  For the 5 Volts  there are a couple of rectifier diodes, and a filter cap feeding the regulator.  With the rectifier diodes lifted,  I read about 15.1VAC coming out of that transformer winding.

 

 

20200308_133008.thumb.jpg.28a26a774523f7242172b26bbfd630ac.jpg

The  yellow and white wires are the "9VAC".  The black and red wires are 5VDC.

 

20200308_142710.thumb.jpg.205d2fce58c7e621f7f2cd4b6e0d04bf.jpg

Here the red and yellow wires are on the 10.4VAC,  I had to drill these holes just a bit bigger to fit the heavier gauge wires.  I've lifted the rectifier diodes, unsoldered the regulator leads and bent them up, and connected the white and blue wires to the 15.1VAC here. The black shield wire is connected to ground.

 

20200308_143859.thumb.jpg.6b636496d6c57b153bfbff2712077b0e.jpg

Notice in the last two pictures that the strain relief fits almost perfectly in this case thought I had to cut away just a little bit of plastic in the top lid to get it to fit.

 

20200308_144924.thumb.jpg.1e8d076464dd3cc12d4afd5034e3284d.jpg

 

Here we see that it seems to work perfectly.  This is the first time I've ever powered up my SVI-328.  The power plug is a very tight fit in the SVI-328,  and I had to use more than the normal amount of force to get it in, but it did seat all the way.  We'll have to see if this is a good permanent solution.  Neither the power supply or the SVI-328 seem to be overheating.  I'll post here, if I run into any issues.

 

 

 

 

Edited by mutterminder
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Thanks for posting information about a third party Commodore power supply that you internally modified so that it works with the SVI-328 when a custom power cable wire harness is attached.

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